Motor Control Device

The present invention relates to a motor control device.

As a motor control device, one that converts direct current power supplied from a battery into alternating current power and drives a motor with the converted alternating current power is known. In this type of motor control device, it is necessary to accurately detect the input current value from the battery and the output current value to the motor, and to control each part based on these detected current values. As a countermeasure for this, a device is known in which a current sensor is installed in the vicinity of an electrode (bus bar) for current conduction connected to the power control circuit (for example, see Patent Document 1).

The current sensor described in Patent Document 1 has a magnetic core and a Hall element (magnetic detection element) configured in the vicinity of an electrode (bus bar) for current conduction connected to the power control circuit. This current sensor is designed to amplify the magnetic field generated due to the current flowing through the bus bar by means of the magnetic core, and to detect the magnetic field amplified by the magnetic core using the Hall element.

[Patent Document 1] Japanese Patent Application Laid-Open (JP-A) No. 2012-37298.

Since the current sensor described in Patent Document 1 has a structure in which a magnetic core and a Hall element are configured in the vicinity of an electrode (bus bar) for current conduction, due to the inclusion of the magnetic core, the overall device becomes larger, and the manufacturing cost also increases.

As a countermeasure for this, in recent years, consideration has been given to detecting the magnetic field generated in the vicinity of the electrode using only magnetic detection elements such as Hall elements without providing a magnetic core. However, in this case, even if the magnetic detection element is brought sufficiently close to the electrode, the detected current value fluctuates greatly due to slight changes in the separation distance between the magnetic detection element and the electrode. Thus, in the case of using a motor control device in equipment where large vibration input is expected, such as in vehicles, there is concern that the detection accuracy of the current flowing through the electrode may decrease.

Thus, the present invention aims to provide a motor control device that may suppress fluctuations in the separation distance between the electrode, which is the detection target, and the magnetic detection element.

To solve the above problem, the motor control device according to the present invention adopts the following configuration. That is, the motor control device of the first aspect of the present invention includes: a base block, on which at least a part of a power control circuit is configured; a pillar portion, protruding from the base block; a substrate, fixed to the base block through the pillar portion; an electrode for current conduction, connected to the power control circuit; and a magnetic detection element, attached to a position proximate to the electrode of the substrate and configured to detect a magnetic field caused by a current flowing through the electrode. The magnetic detection element is configured in a vicinity of a support portion by the pillar portion at an end portion in an extending direction of the substrate.

In the motor control device of this configuration, the end portion in the extending direction of the substrate is supported by the base block through the pillar portion. When there is vibration input externally, the substrate tends to have a large amplitude in the central region. In contrast, the support portion by the pillar portion at the end portion in the extending direction of the substrate is easily suppressed from vibrating by the pillar portion and does not vibrate with a large amplitude even when there is vibration input externally. Thus, the magnetic detection element configured in the vicinity of the support portion by the pillar portion at the end portion in the extending direction of the substrate does not vibrate significantly even when there is vibration input externally. Consequently, in the case of adopting this configuration, fluctuations in the separation distance between the electrode and the magnetic detection element are suppressed.

The motor control device of the second aspect of the present invention, in the motor control device of the first aspect, includes the electrode that is constituted by a plate-shaped bus bar fixed to the base block, and a part of the bus bar is provided with a bending portion that is bent to be proximate to the magnetic detection element.

In this case, even if the separation distance between the fixing portion of the bus bar and the substrate is large, by bringing the bending portion provided on the bus bar close to the substrate side, the separation distance between the bus bar (electrode), which is the detection target, and the magnetic detection element may be sufficiently narrowed.

The motor control device of the third aspect of the present invention, in the motor control device of the first or second aspect, includes a plurality of electrodes, and a plurality of magnetic detection elements are provided in a single row along one edge in the extending direction of the substrate, and the one edge of the substrate is fixed to the base block through a plurality of the pillar portions.

In this case, one edge of the substrate is supported on the base block by a plurality of pillar portions, thereby increasing the rigidity of the one edge of the substrate. Since a plurality of magnetic detection elements are arranged in a single row along this one edge of the substrate with increased rigidity, fluctuations in the separation distance between the plurality of electrodes and the corresponding plurality of magnetic detection elements thereof may be efficiently suppressed.

The motor control device of the fourth aspect of the present invention, in the motor control device of the third aspect, includes the electrodes including: a pair of battery-side bus bars, connected to a battery; and three motor-side bus bars, connected to a three-phase power supply portion of a motor. The battery-side bus bars are respectively configured on outer sides in an alignment direction of the three motor-side bus bars arranged side by side, and the magnetic detection elements are configured in positions proximate to one of the battery-side bus bars and in positions proximate to each of the motor-side bus bars on outer sides in the alignment direction among the three motor-side bus bars.

In this case, the input current from the battery may be detected by the magnetic detection element configured close to one of the battery-side bus bars. Two phases of the output current of the three-phase output current of the motor may be detected by two magnetic detection elements configured close to the two motor-side bus bars on the outer sides among the three motor-side bus bars in the alignment direction. Further, the remaining one phase of the three-phase output current of the motor may be calculated based on the detection values from the two magnetic detection elements configured close to the two motor-side bus bars on the outer sides in the alignment direction. Consequently, by adopting this configuration, the input current and output currents may be reliably detected with the minimum necessary number of magnetic detection elements. Thus, by adopting this configuration, miniaturization and weight reduction of the current detection portion may be achieved.

The motor control device of the fifth aspect of the present invention, in the motor control device of the fourth aspect, includes the pillar portions that are respectively configured in a substantially middle position between one of the motor-side bus bars on the outer sides in the alignment direction and one of the battery-side bus bars adjacent to the motor-side bus bar and in a substantially middle position between other one of the motor-side bus bars on the outer sides in the alignment direction and other one of the battery-side bus bars adjacent to the motor-side bus bar.

In this case, the two pillar portions supporting one edge of the substrate may efficiently suppress fluctuations of each magnetic detection element for detecting the input current and the magnetic detection elements for detecting the output current. Consequently, by adopting this configuration, the support rigidity of the substrate may be sufficiently ensured while reducing the number of pillar portions protruding from the base block, thereby achieving further miniaturization and weight reduction of the entire device.

Since the motor control device according to the present invention includes the magnetic detection elements configured near the support portions by the pillar portions at the end portions in the extending direction of the substrate, even if there is vibration input externally, fluctuation in the separation distance between the electrodes and the magnetic detection elements may be suppressed.

Hereinafter, one embodiment of the present invention is described with reference to the drawings.

1 FIG. 2 FIG. 1 FIG. 3 FIG. 1 FIG. 1 1 14 1 1 1 10 10 10 10 a is a perspective view of the motor control deviceaccording to the embodiment with the upper cover removed.is a perspective view of the motor control devicewith the second substrateinremoved. Further,is a front view of the motor control devicecorresponding to the arrow view III in. The motor control deviceincludes an inverter function that converts direct current power supplied from a battery (not shown) into alternating current power and drives a motor (alternating current motor) (not shown) with the converted alternating current power. The motor control deviceincludes a thin rectangular casewith one side open. A plurality of finsfor heat dissipation protrude from the outer surface of the case. For the convenience of description, the side of the casewith the opening is referred to as “upper,” and the opposite side is referred to as “lower.

10 11 12 13 13 13 10 14 13 13 13 14 11 12 11 11 10 12 10 10 11 12 14 2 FIG. 2 FIG. Inside the opening of the case, the first substrateand a plurality of electrolytic capacitors(see) are accommodated and configured. Further, a plurality of pillar portionsA,B, andC protrude toward the upper side from the case. The second substrateis supported on the upper portions of the plurality of pillar portionsA,B, andC. The second substrateis configured on the upper side of the first substrateand the plurality of electrolytic capacitors, substantially parallel to the first substrate. As shown in, the first substrateis accommodated and configured on one side of the interior of the substantially rectangular casein plan view, and the plurality of electrolytic capacitorsare accommodated and configured on the other side of the interior of the case. Furthermore, an upper cover (not shown) is attached to the upper portion of the case, covering the first substrate, the electrolytic capacitors, the second substrate, and other components from the upper side.

11 15 15 12 16 16 15 The first substrateis a printed wiring board (PWB) on which a plurality of electronic components, including switching elements, are mounted. A plurality of switching elementsare combined with the electrolytic capacitorsto constitute the main portion of the power control circuit. The power control circuitperforms ON/OFF operations through the control of the switching elementsby a controller (not shown), thereby converting the direct current power from the battery into three-phase alternating current power.

16 17 17 18 18 18 17 17 18 18 18 The power control circuitis connected to a pair of battery-side bus barsA andB, which serve as electrodes for conducting electricity on the battery side, and three motor-side bus barsA,B, andC, which serve as electrodes for conducting electricity on the motor side. The pair of battery-side bus barsA andB are connectable to the positive and negative terminals of the battery, respectively, through connection cables (not shown). The three motor-side bus barsA,B, andC are connectable to the U-phase, V-phase, and W-phase power supply portions of the motor, respectively, through connection cables (not shown).

2 FIG. 12 10 12 12 11 19 19 11 10 11 12 10 20 12 12 As shown in, the electrolytic capacitorsconfigured on the other side inside the caseare formed in a substantially cylindrical shape. This plurality of electrolytic capacitorsare configured in parallel in a direction perpendicular to the longitudinal direction thereof (axial direction). The plurality of electrolytic capacitorsare connected to the circuit on the first substratethrough connection bus barsA andB surface-mounted on the first substrate. It is noted that in this embodiment, the caseand the first substrateand electrolytic capacitorssupported by the caseconstitute the main portion of a base block. Hereinafter, the direction along the longitudinal direction (axial direction) of the electrolytic capacitorsis referred to as the X direction. Further, the direction in which the electrolytic capacitorsare configured in parallel is referred to as the Y direction, and the direction perpendicular to both the X direction and Y direction is referred to as the Z direction. Arrows indicating the X direction, Y direction, and Z direction are marked at appropriate locations in the drawings.

11 11 17 17 11 On the upper surface of the first substrate, positive-side circuit terminals and negative-side circuit terminals (not shown), which serve as power input portions from the battery, are mounted. These circuit terminals are configured near the end portions on two sides of the first substratein the Y direction. The battery-side bus barsA andB, which serve as electrodes for conducting electricity, are connected to the positive-side circuit terminals and the negative-side circuit terminals on the first substrate, respectively.

17 17 17 17 17 17 10 17 17 11 17 17 17 17 17 17 10 11 17 17 17 17 The battery-side bus barsA andB are both formed by bending a long plate-shaped conductive metal plate in the longitudinal direction into a hat-like shape. For each battery-side bus barA andB, one end side in the longitudinal direction is formed as a terminal fixing portionAa andBa to be attached to the upper surface of the caseon one end side in the X direction, and the other end side in the longitudinal direction is formed as a circuit fixing portionAb andBb to be connected to the aforementioned positive-side circuit terminal and negative-side circuit terminal on the first substrate. Further, the central region in the longitudinal direction of each battery-side bus barA andB is formed as a bending portionAc andBc that is bent toward the upper side in an approximately U-shape. The battery-side bus barsA andB are fixed to the caseand the first substratewith the terminal fixing portionsAa andBa and circuit fixing portionsAb andBb thereof such that the longitudinal direction thereof aligns with the X direction.

11 18 18 18 Further, on the upper surface of the first substrate, three output-side circuit terminals (not shown) for U-phase, V-phase, and W-phase, which serve as power output portions to the motor, are mounted. These output-side circuit terminals are configured in the central region of the first substrate in the Y direction, spaced substantially equally in the Y direction. The motor-side bus barsA,B, andC, which serve as electrodes for conducting electricity, are connected to each of these output-side circuit terminals, respectively.

18 18 18 17 17 18 18 18 18 18 18 10 18 18 18 11 18 18 18 18 18 18 18 18 18 10 11 18 18 18 18 18 18 The motor-side bus barsA,B, andC are formed, similar to the battery-side bus barsA andB, by bending a long plate-shaped conductive metal plate in the longitudinal direction into a hat-like shape. For each motor-side bus barA,B, andC, one end side in the longitudinal direction is formed as a terminal fixing portionAa,Ba, andCa to be attached to the upper surface of the caseon one end side in the X direction, and the other end side in the longitudinal direction is formed as a circuit fixing portionAb,Bb, andCb to be connected to each of the aforementioned output-side circuit terminals on the first substrate. The central region in the longitudinal direction of each motor-side bus barA,B, andC is formed as a bending portionAc,Bc, andCc that is bent toward the upper side in a substantially U-shape. Each motor-side bus barA,B, andC is fixed to the caseand the first substratewith the terminal fixing portionAa,Ba, andCa and the circuit fixing portionAb,Bb, andCb thereof such that the longitudinal direction thereof aligns with the X direction.

18 18 18 18 18 18 17 18 18 18 17 18 18 18 17 17 18 18 18 17 17 18 18 18 17 17 18 18 18 10 The three motor-side bus barsA,B, andC are configured in a single row side by side along the Y direction. The three motor-side bus barsA,B, andC are configured at equal intervals in the Y direction. One battery-side bus barA is configured adjacent to the outer side of one end side in the alignment direction of the three motor-side bus barsA,B, andC, while the other battery-side bus barB is configured adjacent to the outer side of the other end side in the alignment direction of the three motor-side bus barsA,B, andC. Consequently, the pair of battery-side bus barsA andB and the three motor-side bus barsA,B, andC are arranged in a single row side by side along the Y direction. The terminal fixing portionsAa,Ba,Aa,Ba, andCa of the battery-side bus barsA andB and the motor-side bus barsA,B, andC are aligned in a single row along the Y direction at one end side of the casein the X direction.

14 14 11 21 22 10 22 14 2 FIG. The second substrateis a printed wiring board (PWB) on which electronic components are mounted. The circuit printed on the second substrateis connected to the circuit on the first substratethrough the inter-substrate connector(see). Further, a signal connectoris held between the caseand the upper cover (not shown). A plurality of signal terminals protruding from the signal connectorare also connected to the circuit on the second substrate.

14 14 10 20 13 10 13 14 13 14 14 13 45 1 FIG. The second substrateis formed in a substantially rectangular shape as shown in. One edge of the second substratein the X direction is fixed to the case(base block) through a pair of pillar portionsA protruding from the case. The pair of pillar portionsA are configured apart from each other in the Y direction, and each penetrates the second substratein the up and down direction. The upper surface of each pillar portionA supports one edge of one side of the second substratein the X direction. In this state, the edge of one side of the second substratein the X direction is fastened and fixed to the upper end portion of each pillar portionA by fixing screws.

14 10 13 13 10 14 13 13 46 13 14 13 23 14 The other side of the second substratein the X direction is fixed to the casethrough two pairs of pillar portionsB andC protruding from the case. The edge of the other side of the second substratein the X direction is placed on the upper surface of one pair of pillar portionsC, and in this state, the edge is fixed to the upper end portion of each pillar portionC by fixing screws. Further, another pair of pillar portionsB penetrates the second substratein the up and down direction, and in this state, the pillar portionsB are fitted into the fitting holesof the second substrate.

14 40 40 14 17 17 40 17 17 40 17 17 On the lower surface of the second substrate, near one side in the X direction (at the end portion of the extending direction), three Hall ICs, which are magnetic detection elements incorporating Hall elements, are attached. One Hall ICis configured below the second substrate, facing the bending portionAc of one battery-side bus barA (for example, the positive pole side bus bar). This Hall ICfaces the upper surface of the bending portionAc of the battery-side bus barA with a minute gap in between. This Hall ICdetects the magnetic force generated in response to the direct current from the battery flowing through the battery-side bus barA. The detection circuit determines the current value flowing through the battery-side bus barA based on this detected magnetic force.

40 14 18 18 40 18 18 40 16 18 18 Another Hall ICis configured below the second substrate, facing the bending portionAc of the motor-side bus barA at one end side of the alignment direction. This Hall ICfaces the upper surface of the bending portionAc of the motor-side bus barA with a minute gap in between. This Hall ICdetects the magnetic force generated in response to the alternating current flowing from the power control circuitto the motor-side bus barA. The detection circuit determines the current value flowing through the motor-side bus barA based on this detected magnetic force.

40 14 18 18 40 18 18 40 16 18 18 Further, the remaining one Hall ICis configured below the second substrate, facing the bending portionCc of the motor-side bus barC at the other end side of the alignment direction. This Hall ICfaces the upper surface of the bending portionCc of the motor-side bus barC with a minute gap in between. This Hall ICdetects the magnetic force generated in response to the alternating current flowing from the power control circuitto the motor-side bus barC. The detection circuit determines the current value flowing through the motor-side bus barC based on this detected magnetic force.

40 18 18 18 18 50 18 18 50 18 40 In the present embodiment, no Hall ICis provided for detecting the current flowing through the central motor-side bus barB. The current value of the current flowing through the central motor-side bus barB is calculated based on the detected values of the currents flowing through the motor-side bus barsA andC on two sides. Further, a magnetic shield member, such as permalloy, is attached around the bending portionBc of the central motor-side bus barB. This magnetic shield memberis intended to prevent the magnetic field caused by the current flowing through the central motor-side bus barB from affecting the detection results of the Hall ICs.

40 It is noted that, in the present embodiment, although Hall ICsare used, which include Hall elements and amplification circuits packaged together, the Hall elements and amplification circuits may be configured separately. In this case, at least the Hall elements are configured near the corresponding bus bars. Further, the magnetic detection elements are not limited to Hall elements. The magnetic detection elements may be other elements as long as they are capable of detecting the magnetic field generated in response to the current flowing through the corresponding bus bars (electrodes).

40 14 14 13 14 14 14 13 45 40 14 a a Here, the installation portions for the three Hall ICsmentioned above are all configured near the support portionsof the second substrate, which are supported by the pillar portionsA at the edges (end portions in the extending direction) of the second substrate. In the present embodiment, the support portionsat the edges of the second substrateare formed by the clamping portions consisting of the upper end surfaces of each pillar portionA and the head portions of the fixing screws. Further, the three Hall ICsconfigured at the edge of the second substrateare arranged in a single row along the edge (along the Y direction).

13 13 18 17 18 40 18 18 40 17 17 14 13 a The positional relationship between each pillar portionA and the bus bars is as follows. One of the pillar portionsA is configured in a substantially middle position between the motor-side bus barA at one end side of the alignment direction and the one battery-side bus barA adjacent to the motor-side bus barA. As a result, the Hall ICconfigured facing the upper surface of the bending portionAc of the motor-side bus barA and the Hall ICconfigured facing the upper surface of the bending portionAc of the battery-side bus barA are located at substantially equal distances from the support portionsupported by one of the pillar portionsA.

13 18 17 18 40 18 18 14 13 40 18 14 13 a a The other pillar portionA is configured in a substantially middle position between the motor-side bus barC at the other end side of the alignment direction and the other battery-side bus barB adjacent to the motor-side bus barC. The distance from the Hall ICconfigured facing the upper surface of the bending portionCc of the motor-side bus barC to the support portionsupported by the other pillar portionA is substantially equal to the distance from the Hall ICon the motor-side bus barA side to the support portionsupported by one of the pillar portionsA.

14 40 40 40 1 a These distances (the distances from each support portionto the nearby Hall ICs) are set to ensure that the vibration amplitude at the installation portions of the Hall ICsremains within an allowable range in response to external vibration input. The term “allowable range” here refers to a range within which the magnetic field (current) detection values obtained by the Hall ICshave an allowable error range. Further, in the present embodiment, the external input vibration is assumed to be the input vibration experienced when the motor control deviceis mounted in a vehicle.

1 40 14 13 14 1 17 18 18 40 a As described above, in the motor control deviceof the present embodiment, the Hall ICs(magnetic detection elements) are configured near the support portionssupported by the pillar portionsA at the end portions in the extending direction of the second substrate. As a result, in the motor control deviceof the present embodiment, even in response to external vibration input, fluctuations in the separation distance between the electrodes for current conduction (the battery-side bus barA and the motor-side bus barsA andC) and the Hall ICs(magnetic detection elements) may be suppressed.

14 14 13 40 14 13 14 1 40 a In other words, although the central region of the second substratetends to experience large amplitude vibrations in response to external vibration input, the end portions of the second substratein the extending direction thereof, which are supported by the pillar portionsA, do not vibrate with large amplitude even in response to external vibration input. As a result, the Hall ICs(magnetic detection elements) configured near the support portionssupported by the pillar portionsA at the end portions of the second substratein the extending direction thereof do not vibrate significantly even in response to external vibration input. Consequently, the motor control deviceof the present embodiment may suppress fluctuations in the separation distance between the electrodes for current conduction (bus bars) and the Hall ICs(magnetic detection elements) even in response to external vibration input.

Thus, by adopting the motor control device of the present embodiment, the detection accuracy of the current flowing through the electrodes (bus bars) may be improved consistently. Consequently, this may contribute to the United Nations'Sustainable Development Goals (SDGs), specifically Goal 7 “Ensure access to affordable, reliable, sustainable and modern energy for all” and Goal 8 “Promote sustained, inclusive and sustainable economic growth, full and productive employment and decent work for all”.

1 17 18 18 17 18 18 40 14 14 17 18 18 14 40 40 Furthermore, in the motor control deviceof the present embodiment, the bus bars (battery-side bus barA, motor-side bus barsA andC) serving as electrodes for current conduction include bending portionsAc,Ac, andCc that are provided near the Hall ICson the second substrate. As a result, even in the case where there is a large separation distance between the fixing portion of the bus bars and the second substrate, by positioning the bending portionsAc,Ac, andCc of the bus bars close to the second substrate, the separation distance between the bus bars (electrodes) to be detected and the Hall ICsmay be sufficiently reduced. Consequently, by adopting this configuration, the detection accuracy of the Hall ICsmay be further improved.

1 40 14 14 10 20 13 40 14 13 40 17 18 18 Further, in the motor control deviceof the present embodiment, a plurality of Hall ICsare arranged in a row along one edge in the extending direction of the second substrate, and this edge of the second substrateis fixed to the case(base block) through a plurality of pillar portionsA. As a result, the plurality of Hall ICsare configured along one edge of the second substrate, which has increased rigidity due to the plurality of pillar portionsA. Consequently, by adopting this configuration, fluctuations in the separation distance between the plurality of Hall ICsand the opposing bus bars (battery-side bus barA, motor-side bus barsA andC) may be efficiently suppressed.

1 17 17 18 18 18 40 17 18 18 18 18 18 40 17 40 18 18 40 18 18 1 40 Furthermore, in the motor control deviceof the present embodiment, the battery-side bus barsA andB are configured on the outer sides in the alignment direction of the three motor-side bus barsA,B, andC arranged in a row. Then, the Hall ICsare configured near one battery-side bus barA and near each of the motor-side bus barsA andC on the outer sides among the three motor-side bus barsA,B,C in the alignment direction. As a result, the input current from the battery may be detected by the Hall ICconfigured near one battery-side bus barA, and two phases of the output current of the three-phase output current to the motor may be detected by the two Hall ICsconfigured near the two motor-side bus barsA andC on the outer sides in the alignment direction. Further, the remaining one phase of the motor output current may be calculated based on the detection values from the two Hall ICsconfigured near the two motor-side bus barsA andC on the outer sides in the alignment direction. Thus, by adopting this configuration of the motor control device, the input current and the output current may be reliably detected using the minimum necessary number of Hall ICs. Consequently, miniaturization and weight reduction of the current detection section may be achieved.

1 13 18 17 18 13 18 17 18 13 14 40 40 14 13 20 Further, in the motor control deviceof the present embodiment, one of the pillar portionsA is configured in a substantially middle position between one motor-side bus barA on the outer side in the alignment direction and the one battery-side bus barA adjacent to the motor-side bus barA. Then, the other pillar portionA is configured in a substantially middle position between the other motor-side bus barC on the outer side in the alignment direction and the battery-side bus barB adjacent to the motor-side bus barC. As a result, the two pillar portionsA supporting one edge of the second substratemay efficiently suppress fluctuations in both the Hall ICsfor detecting input current and the Hall ICsfor detecting output current. Consequently, by adopting this configuration, the support rigidity of the second substratemay be sufficiently ensured while reducing the number of pillar portionsA protruding from the base block, thereby achieving further miniaturization and weight reduction of the entire device.

40 18 18 40 18 18 18 It should be noted that the present invention is not limited to the above-mentioned embodiment, and various design changes are possible within the scope of the present invention. For example, in the above-described embodiment, although magnetic detection elements (Hall ICs) are configured opposite to two motor-side bus barsA andC respectively, the magnetic detection elements (Hall ICs) may be configured opposite to each of the three motor-side bus barsA,B, andC.

16 11 12 16 14 Further, in the above-described embodiment, although the power control circuitis configured with components mounted on the first substrateand the electrolytic capacitor, a part of the power control circuitmay be provided on the second substrate.

Further, in the above-described embodiment, although the electrodes for conducting electricity are configured with bus bars, the electrodes for conducting electricity are not limited to bus bars. The electrodes for conducting electricity may be, for example, wire-shaped or block-shaped, as long as they are capable of conducting electricity.

13 14 13 13 Furthermore, in the above-described embodiment, although a pair of pillar portionsA are configured to support the end portion of the second substrate(substrate) where the Hall ICs (magnetic detection elements) are located, the number of these pillar portionsA is not limited to two. The number of pillar portionsA may be three or more, or may be one.

14 14 14 Further, in the above-described embodiment, although the Hall ICs (magnetic detection elements) are configured only at one end portion (X-direction end portion) in the extending direction of the second substrate(substrate), the Hall ICs (magnetic detection elements) may be configured at the other end portion in the extending direction of the second substrate(substrate) as well. In this case, the Hall ICs (magnetic detection elements) configured at the other end portion in the extending direction of the second substrate(substrate) may be located in the vicinity of a support portion provided by any of the pillar portions.

17 17 18 18 18 17 17 18 18 18 17 17 18 18 18 Further, in the above-described embodiment, bending portionsAc,Bc,Ac,Bc, andCc are provided on the battery-side bus barsA andB and the motor-side bus barsA,B, andC, respectively. However, in the case where each bus bar may be sufficiently brought close to the corresponding Hall IC (magnetic detection element), the bending portionsAc,Bc,Ac,Bc, andCc are not necessarily required to be provided.

1 10 10 11 12 12 13 13 13 14 14 15 16 17 17 17 17 17 17 17 17 18 18 18 18 18 18 18 18 18 18 18 18 19 19 20 21 22 23 40 45 46 50 a a . . . Motor control device,. . . Case,. . . Fin,. . . First substrate,. . . Electrolytic capacitor,. . . Capacitor,A,B,C . . . Pillar portion,. . . Second substrate (substrate),. . . Support portion,. . . Switching element,. . . Power control circuit,A,B . . . Battery-side bus bar,Aa,Ba . . . Terminal fixing portion,Ab,Bb . . . Circuit fixing portion,Ac,Bc . . . Bending portion,A,B,C . . . Motor-side bus bar,Aa,Ba,Ca . . . Terminal fixing portion,Ab,Bb,Cb . . . Circuit fixing portion,Ac,Bc,Cc . . . Bending portion,A,B . . . Connection bus bar,. . . Base block,. . . Inter-substrate connector,. . . Signal connector,. . . Fitting hole,. . . Hall IC,,. . . Fixing screw,. . . Magnetic shield member.